On Saturday, "48 Hours" will take a new look at the case of Lori Vallow and her missing children, Tylee Ryan, 17, and Joshua "JJ" Vallow, 7. On the CBS crime show, Vallow's mother, Janis Cox, and sister, Summer Shiflet, will speak out in their first network interview about the investigation that has emerged regarding the whereabouts of the missing children.

As stated by AZ Central, the Rexburg, Idaho residents went missing in 2019 after moving from Arizona. Following the relocation, Tylee was last seen hiking in Yellowstone National Park and JJ was seen for the final time in footage that was captured from a doorbell camera, according to Crime Online.

Due to Tylee's last known location, some have speculated that she could have been pushed into one of the "hot pots" inside the national park, which are boiling pools that have the acidity of battery acid.

READ: '48 Hours' New Season: Is CBS Show Canceled Or Renewed For Season 33?

Dee Ann Carter, a member of the "Christmas Misery" Facebook group, will also appear in the new episode. During her conversation with CBS News correspondent Jonathan Vigliotti, Carter said that she is furious when she thinks about Vallow.

"She's off in Hawaii, getting married, having fun, when the whole United States is trying to find these kids. But, she will not say anything about her children," elaborated Carter in the preview below.

Continuing, she added, "The hardest part is learning more facts that come to light and the possibility that the children are no longer alive."

As stated by someone close to the case, "Months later, there's no sign of life, there's no sign of death. There are just questions. Frustrating questions."

Shiflet is also featured in the new CBS episode, where she states that she has had to see her family "slaughtered on the news every day." She then said that she has seen things about her sister that are untrue.

"Lori would never harm her children," Shiflet later says, which is a sentiment echoed by Cox, as she added, "She would never harm her children, and I know her."

On Saturday night, those who tune in to the CBS crime show will get to see the aforementioned interviews and hear new details surrounding the ongoing investigation into the whereabouts of the missing children.

The new episode of "48 Hours," called "The Missing Children of Lori Vallow Daybell," airs Saturday at 10 p.m. EDT on CBS.

Police Car
In this photo, police cars sit on Main Street in Dallas, Texas, on July 7, 2016. Laura Buckman/AFP/Getty Images